SOLUTION: Tom is 4 years old. His mother is 9 times as old as he is. How old will Tom's mother be when she is 5 times as old as Tom?

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Question 1079968: Tom is 4 years old. His mother is 9 times as old as he is. How old will Tom's mother be when she is 5 times as old as Tom?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Tom now, 4
Mother now, 36

x, how many years until Mother is 5 times Tom

5%284%2Bx%29=36%2Bx
20%2B5x=x%2B36
4x=36-20
4x=16
x=4

Tom will be 8 and his mother will be 40.